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에지 영역을 보상한 원격 센싱된 인공위성 화상의 부호화
김영춘,이건일 ( Young Choon Kim,Kuhn Il Lee ) 한국센서학회 1997 센서학회지 Vol.6 No.5
In this paper, we propose a coding method of remotely sensed satellite image with edge region compensation. This method classifies each pixel vector considering spectral reflection characteristics of satellite image data. For each class, we perform classified intraband VQ and classified interband prediction to remove intraband and interband redundancies, respectively. In edge region case, edge region is compensated using class information of neighboring blocks and gray value of quantized reference bands. Then we perform classsified interband prediction using compensated class information to remove interband redundancy, effectively. Experiments on LANDSAT TM satellite images show that coding efficiency of the proposed method is better than that of the conventional methods.
영역 분류 및 대역간 상관성을 이용한 원격 센싱된 인공위성 화상데이타의 부호화
김영춘,이건일 한국통신학회 1997 韓國通信學會論文誌 Vol.22 No.8
In this paper, we propose a coding method of remotely sensed satellite image data using region classification and interband correlation. This method classifies each pixel vector consider spectral characteristics. Then we perform the classified intraband VQ to remove spatial (intraband redundancy for a reference band image. To remove interband redundancy effectively, we perform the classified interband prediction for the band images that the high correlation spectrally and perform the classified interband VQ for the remaining band images. Experiments on LANDSAT TM image show that the coding efficiency of the proposed method is better than that of the conventional Gupta's method. Especially, this method removes redundancies effectively for satellite iamge including various geographical objects and for and images that have low interband correlation.
차세대 전투기 Sensor Pod 장착 위치 선정에 관한 연구
김영춘,양청일,양창건,신항철 한국항공우주학회 2016 한국항공우주학회 학술발표회 논문집 Vol.2016 No.4
미래의 항공기는 다양한 시스템들이 복잡한 구조로 구성되어 있으며 각 시스템들이 유기적으로 동작할 때 비로소 그 목적에 맞게 운영될 수 있다. 이런 다양하고 복잡한 시스템들로 구성된 차세대 항공기를 개발하는 과정 중, 항공기 외부에 장착되는 센서의 성능을 극대화하기 위한 위치 선정은 중요한 과정이다. 본 논문은 저고도 침투를 통한 정밀 타격 임무 수행에 필수적인 Navigation Pod 와 EO Targeting Pod 에 대해 Obscuration 해석 프로그램을 통한 LOS Blockage 분석과 항공기 체계 통합요구사항 검토를 통해 최적의 장착 위치 선정에 관해 연구하였다. The future aircraft is composed of the various systems which are complicated structure and can be operating when each system are operating organically. In the development process for next generation aircraft consisting of these various and complicated system, the analysis the operating requirement to install on the optimal position of the aircraft is the essential process in order to maximize the unique performance of subsystem. In this study, we researched optimized position through LOS blockage analysis using the obscuration analysis program and review aircraft system integration requirement regarding Navigation Pod and EO Targeting Pod that is the essential equipment to the low altitude ingress and precision attack mission.
분류 벡터 양자화 및 DPCM을 이용한 블럭 웨이브릿 변환 영상 부호화
김영춘,정원식,이건일,김경규,이승진 경북대학교 전자기술연구소 1997 電子技術硏究誌 Vol.18 No.1
In this paper, we propose a block wavelet transform coding of images using classified vector quantization to exploit the inter-band correlation and to eliminate the blurring effect at a smoothly changed edge. In this scheme, DWT coefficients are rearranged to compose the small blocks, which are made up of the corresponding coefficients from all the subbands. These blocks are classified into four classes relying on the directional energies of the second level subband along each direction to eliminate the blurring effect. These are further divided adaptively into subvectors depending on the DWT coefficient statistics as this allows efficient distribution of bits. The subvectors are then vector quantized and DPCM is applied to DC coefficients. Simulation results show that this coding scheme performs a good result compared to other approaches.